SOLUTION: It has been found that 7 per cent of the tools manufactured by a factory are defective. What is the probability that in a shipment of 625 such tools (a) 8 per cent or more, and (b

Question 742997: It has been found that 7 per cent of the tools manufactured by a factory are defective. What is the probability that in a shipment of 625 such tools (a) 8 per cent or more, and (b) 7 per cent or less will be defective
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
It has been found that 7 per cent of the tools manufactured by a factory are defective. What is the probability that in a shipment of 625 such tools
(a) 8 per cent or more
8% of 625 = 50
Binomial Problem with n = 625 and p(defective) = 0.08
P(50<= x <=625) = 1 - binomcdf(625,0.07,49) = 0.1824
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(b) 7 per cent or less will be defective
7% of 625 = 44
P(0<= x <=44) = binomcdf(625,0.07,44) = 0.5556
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Cheers,
Stan H.

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